I was just shooting my bow. I' ve been practicing one shot, put bow down, get arrow, shoot again. I' ve been doing this for weeks with good results.

So I concentrate on the dot on the bag target 25 yards away, draw, release, bullseye. I get my arrow, repeat.

Upon release, I hear a sharp " sound" from my bow, and my arrow impacts 4 inches low. I examine my bow, sight is still mounted solid, string and cables are in their correct grooves, only things I notice out of place is the upper string leach has slid all the way up to the idler wheel string serving, and my Tru speed nok is now perpendicular to the string. I take another shot, same weird noise, leach is in bad shape, so I take it off. Further examine my bow, nothing. Arrow again hit 4 inches low. I repeated this 3-4 times, same result. I also noticed that the valley seems almost non-existant, and the bow wants to scream forward from the wall. It seems like I' ve suddenly lost several FPS.

I shoot a Diamond Hornet, with the BT post feed cam, 65% let off. Any thoughts as to what might be going on? It' s got me scratching my head...